Version: 2.1
Type: Sample Code (HOWTO)
Category: Algorithms
License: GNU General Public License
Description: Will check to see if an email address is in the proper format.
<?php function emailsyntax_is_valid($email) { $to_work_out = explode("@", $email); if (!isset($to_work_out[0])) return FALSE; if (!isset($to_work_out[1])) return FALSE; $pattern_local = '^([0-9a-z]*([-|_]?[0-9a-z]+)*)(([-|_]?).([-|_]?)[0-9a-z]*([-|_]?[0-9a-z]+)+)*([-|_]?)$'; $pattern_domain = '^([0-9a-z]+([-]?[0-9a-z]+)*)(([-]?).([-]?)[0-9a-z]*([-]?[0-9a-z]+)+)*.[a-z]{2,4}$'; $match_local = eregi($pattern_local, $to_work_out[0]); $match_domain = eregi($pattern_domain, $to_work_out[1]); if ($match_local && $match_domain) { return TRUE; } return FALSE; } ?> Use the function like this : if (emailsyntax_is_valid($email)) { echo "Ok"; } or if (!emailsyntax_is_valid($email)) { echo "Invaild"; }